Geophysical exploration of the Boku geothermal area, Central Ethiopian Rift

Abiye, Tamiru; Haile, Tigistu

doi:10.1016/j.geothermics.2008.06.004

Cited by 26 publications

(9 citation statements)

References 5 publications

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“…In recent years, geophysical methods have been commonly used in the investigation and development of geothermal resources, especially with the development of technology, and these methods have provided successful results (Majumdar et al 2000;El-Quady 2006;Özürlan and Şahin 2006;Drahor and Berge 2006;Abiye and Haile 2008;Wu et al 2012). Although many geophysical methods are used in geothermal fields, electrical resistivity is one of the most preferred methods for investigating many geothermal fields.…”

Section: Methodsmentioning

confidence: 99%

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

et al. 2019

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The Şavşat (Artvin, Turkey) Geothermal Field (ŞGF) is located on the northeastern border of Turkey. This field is characterized by thermal and mineralized springs and travertine. The temperature of the thermal water is 36 °C, whereas that of the mineralized spring in the area is approximately 11 °C. The Na-HCO 3 -Cl-type thermal water has a pH value of 6.83 and an EC value of 5731 µS/cm. The aim of this study is to characterize the geothermal system by using geological, geophysical, and hydrogeochemical data and to determine its hydrochemical properties. A conceptual hydrogeological model is developed for the hydrogeological flow system in the ŞGF. According to the hydrogeological conceptual model created by geological, geophysical, and hydrogeochemical studies, the reservoir comprises volcanogenic sandstone and volcanic rocks. The cap rock for the geothermal system is composed of turbiditic deposits consisting of mudstone-siltstone-sandstone alternations. An increase in the geothermal gradient is mainly due to Pleistocene volcanic activity in the field. The isotopic values of thermal water (δ 18 O, δ 2 H, δ 3 H) indicate a deeply circulating meteoric origin. The estimated reservoir temperature calculated by silica geothermometers is 100-150 °C, and the mixing rate of cold groundwater with geothermal waters is approximately 70%. It may be possible to obtain warmer fluids from a 300-m-deep borehole cutting through a fracture zone identified by geophysical studies. Heating by conduction via the geothermal gradient resulting from young volcanic activity drives geothermal waters upwards along faults and fractures that act as hydrothermal pathways. The positive δ 13 C VPDB value (+ 4.31‰) indicates a metamorphic origin for the thermal water. The 34 S CDT value (~ 10‰) shows that the sulfur in the geothermal water is derived from volcanic sulfur (SO 2 ). which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.hydrogeochemical and isotope techniques have been widely used elsewhere to determine the hydrodynamic structure of geothermal systems in recent years (Tarcan et al. 2005;Piscopo et al. 2006; Schaffer and Sass 2014; Yurteri and Şimşek 2017;Uzelli et al. 2017). In this geothermal field, there has not been any study that employs a conceptual approach based on hydrogeological and hydrogeochemical studies, such as hydrochemical facies compositions, isotopic features, water-rock interactions, mixing processes, and reservoir temperature. This study focuses on understanding the mechanism of the geothermal system in the ŞGF for future use, determining the areas with higher temperatures and revealing the hydrogeochemical characteristics of the geothermal water. In accordance with this purpose, geological, geophysical, and hydrogeochemical studies were performed in the area to characterize components such as the reservoir, geothermal fluids, and...

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Section: Methodsmentioning

confidence: 99%

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

et al. 2019

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“…These include gravity, magnetic , electromagnetic, resistivity, self-potential, radiation, geothermal, seismic and seismological techniques [14,15,16,17,18,19,20,21]. Such methods have been combined and successfully tried in different geothermal localities worlwide [22,23,24,25,26,27,28] . Based on density, magnetic susceptibility and seismic velocity contrasts between the sedimentary rocks and the volcanic intrusions, most geophysical methods proved to be very powerful in: 1) locating subsurface geological structures, particularly faults and the estimation of their characteristics; 2) locating volcanic intrusions, their depths, sizes, temperature and status; 3) studying subsurface layering, thicknesses, rock types and their physical properties; 4) studying the movements of the groundwater, its salinity and temperature; and 5) locating hot spots that supply heat to the circulating groundwater.…”

Section: Ment Of Commerce Under Grant Bs123456mentioning

confidence: 99%

Utilization of geothermal energy in Jordan

Zaid

El-Isa

El-Kilani

2015

2015 Power Generation System and Renewable Energy Technologies (PGSRET)

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Jordan is a developing non-producing oil country; the major part of its needed energy is imported from the neighboring countries in the forms of oil and gas, for example, in year 2007 the demand for primary energy reached about 7438 million tons of oil equivalent, with a growth rate 3.5 % which is 1.2% more than the year before and is expected to be much more in the future due to the immigration from the neighboring countries because of the war crisis in the neighboring countries. The cost of this imported energy creates a heavy financial burden on the national economy which reflects on the development plans and the standard living of the people. Therefore it is of great necessity to look for utilizing other energy resources. Investigations and research work carried out by universities staff and the National Energy Research Center have shown evidence that Jordan has a potential geothermal source of energy which can be utilized in producing heat and electricity.In this paper Bouguer gravity data, obtained from a detailed gravity survey that was conducted at the Zarqa Main Zara geothermal field, east of the Dead Sea, are evaluated and combined with other previously obtained geophysical results including aeromagnetic, deep seismic soundings and seismicity. The observed gravity data clearly reflect the complex nature of the structural geology and tectonics of the study region. It revealed the presence of a number of local and regional Bouguer anomalies with different sizes, amplitudes and orientations. These anomalies are interpreted to have been caused by subsurface basic to ultrabasic igneous intrusions located within the uppermost part of the crust, mostly at depths 0.5km 1.5km or shallower. With a density 3.15 g/cm³ 3.2 g/cm³, these have originated from the upper mantle. Travel times of P and S-waves propagating through the study region indicate that some of the subsurface bodies may be in a semi-solid state. The elevated temperature of the geothermal springs of the study area is suggested to be caused by deep water circulation that is facilitated by the permeability of the sedimentary and igneous rocks and both local and regional faults. The hot igneous intrusions remain the major source of heating, though normal geothermal gradient may add slightly to this heating process. The temperatures of the water springs in Zarqa Main-Zara thermal springs are below the boiling point; severalThis paragraph of the first footnote will contain the date on which you submitted your paper for review. It will also contain support information, including sponsor and financial support acknowledgment. For example, applications are suggested to be utilized in the agricultural and industrial fields. Finally, the binary thermodynamic cycle is suggested to utilize this geothermal source in a power plant for generating electricity as the total flow of this thermal water is 25X 10^6 m3/year with an average temperature of 50 degrees centigrade. An approximate estimation of the output power is 3-4 Mega-Watt..

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“…1). The volcanic rocks embedded along the NE-SW aligned faults have erupted mainly from Boku and Gademsa volcanoes (Alemayehu and Vernier 1997;Haile et al 2002;Abiye and Haile 2008;Furi et al 2011a) which are actively generating thermal water, geysers and fumaroles. The extensional tectonics and rift-in-rift structures of the area play an important role in controlling groundwater recharge and discharge mechanisms.…”

Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

“…1), is about 400 m in depth; in this location there is an estimated geothermal gradient of 0.17°C/m (Alemayehu and Vernier 1997). This is due to the fact that the Main Ethiopian Rift (MER) is the site of a positive thermal anomaly within which one can find local anomalies associated directly with volcanism (UNDP 1973;Ayele 2001;Abiye and Haile 2008). The widespread thermal anomaly is not only due to volcanism but also due to the locally high geothermal gradient which is responsible for the generation of some thermal springs on highlands and marginal rifts (Alemayehu 2003).…”

Section: Introductionmentioning

confidence: 99%

The interference of a deep thermal system with a shallow aquifer: the case of Sodere and Gergedi thermal springs, Main Ethiopian Rift, Ethiopia

Haile

Abiye

2012

Hydrogeol J

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An integrated survey program involving geological, hydrogeological and geophysical techniques has been employed to characterize the aquifer geometry, recharge and circulation dynamics of thermal springs within a shallow aquifer system in Ethiopia. The selected springs for the case study are Sodere and Gergedi, which are situated within the tectonically active Main Ethiopian Rift (MER). Geologically, the studied springs are located on PlioQuaternary volcanic rocks. The geophysical results indicate the presence of subsurface weak zones represented by extensional tectonics and weathering zones which are responsible for thermal water circulation and facilitate recharge from the adjacent surface-water bodies. The structures inferred by the resistivity survey, both sounding and electrical tomography, present contrasts in rock resistivity response. The anomalous zones in the magnetic data are in good agreement with the zones that are revealed by geological mapping and surface manifestation of the thermal water discharge zones. The shallow aquifer of the central MER is under the influence of thermal water, which increases the groundwater temperature and mineral content.

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Geophysical exploration of the Boku geothermal area, Central Ethiopian Rift

Cited by 26 publications

References 5 publications

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

Conceptual model of the Şavşat (Artvin/NE Turkey) Geothermal Field developed with hydrogeochemical, isotopic, and geophysical studies

Utilization of geothermal energy in Jordan

The interference of a deep thermal system with a shallow aquifer: the case of Sodere and Gergedi thermal springs, Main Ethiopian Rift, Ethiopia

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